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Key system design considerations

• Does the system have extract grilles fitted in each of the "wet" areas of the home i.e. in the kitchen, utility room, bathrooms, shower rooms, en-suite's, WC's, etc?
• Do the extract grilles incorporate filters as recommended in BRE Digest 398? If not, is filtration incorporated elsewhere in the system, e.g. within the central extract fan unit itself, to protect the fan/motor/electrical/electronic components within the fan unit from a build up of potentially hazardous contaminants?
• Under floor central heating (UFCH) means no radiators - clear walls not spoiled by unsightly radiators, and useable wall space not interrupted by spaceconsuming radiators. Often the interior decoration and layout of a whole room is determined by the siting of radiators.
• UFCH is cleaner than radiator systems in two respects: it does not cause dirty walls (a common problem with radiators), and it does not cause circulation of airborne dust (and dust mites) as would a radiator.
• Undoubtedly UFCH gives greater room comfort, because of its uniformity of temperature, and also because of the benefits of warmth at floor/foot level rather than heat higher in the room (and cold floors) as with radiator systems.
• Do the extract grilles incorporate filters as recommended in BRE Digest 398? If not, is filtration incorporated elsewhere in the system, e.g. within the central extract fan unit itself, to protect the fan/motor/electrical/electronic components within the fan unit from a build up of potentially hazardous contaminants?
• Has the ducting system been properly designed with particular attention being given to the appropriate incorporation of fire dampers?
• Is the central fan unit capable off/ne tuning of the systems Airflow to ensure that the "background" and "boost" flow rates are achieved by fan speed regulation as opposed to airflow throttling thus ensuring low noise levels, minimum electrical consumption?
• Is the central fan provided with twin speed controls to provide this fine tuning?
• Does the central extract fan incorporate controls designed to ensure Set "background" and "boost" airflow rates are maintained as the systems filters get dirty?
• Is the system provided with controls which will allow simple switching to "boost" from external switches or devices?
• When "boost" is activated is it desirable to have a time adjustable run on faculty?
• If so, have the appropriate controls been included in the system?
• Is the extract rate from each individual "wet" area fully adjustable at a point or points other than the room extract point to minimise noise, prevent the unbalancing of the system during routine cleaning of extract grilles or valves, aid initial commissioning and allow for future adjustment of the system if required?
• MEV systems simply have to be quiet as they operate all day and all night.
• Has the complete system been designed to be as quiet as possible?
• Is the system backed by a suitably good warranty?